The latest officially reported population of Chad was 21,003,705 in 2025 vs 21,756,000 people in Sri Lanka in 2025. In 2026, based on the adjusted UN estimation, the current Chad's population is 21,855,137 people compared to 21,926,160 in Sri Lanka.
Population statistics:
- Sri Lanka's population is 1 times bigger than Chad's.
- Chad is ranked the 64th most populous country in the world, while Sri Lanka is the 63rd.
- The countries together account for 0.53% of the world: 0.26% for Chad vs 0.26% for Sri Lanka.
- For the last 10 years, Chad has had an average growth rate of +3.63% per year vs +0.42% in Sri Lanka.
- Since 2006, the population of Chad has increased from 10.7M people to 21.9M (104.1% growth), while Sri Lanka has grown from 20.4M to 21.9M (7.73% growth).
Chad vs Sri Lanka: population by year and forecast
| Year | Population | |
|---|---|---|
Chad
|
Sri Lanka
|
|
| 2100 | 70,311,013 | 20,009,380 |
| 2099 | 69,986,866 | 20,121,095 |
| 2098 | 69,662,155 | 20,234,513 |
| 2097 | 69,277,239 | 20,345,619 |
| 2096 | 68,889,445 | 20,456,607 |
| 2095 | 68,502,128 | 20,566,246 |
| 2094 | 68,110,775 | 20,674,019 |
| 2093 | 67,684,792 | 20,780,946 |
| 2092 | 67,233,921 | 20,886,274 |
| 2091 | 66,781,244 | 20,990,047 |
| 2090 | 66,290,702 | 21,095,968 |
| 2089 | 65,798,812 | 21,198,788 |
| 2088 | 65,317,154 | 21,299,229 |
| 2087 | 64,800,745 | 21,398,269 |
| 2086 | 64,278,192 | 21,496,892 |
| 2085 | 63,727,856 | 21,594,661 |
| 2084 | 63,168,104 | 21,687,323 |
| 2083 | 62,596,574 | 21,778,597 |
| 2082 | 62,040,380 | 21,866,395 |
| 2081 | 61,434,119 | 21,954,337 |
| 2080 | 60,826,765 | 22,038,953 |
| 2079 | 60,198,617 | 22,122,744 |
| 2078 | 59,555,772 | 22,200,069 |
| 2077 | 58,918,103 | 22,274,355 |
| 2076 | 58,275,388 | 22,345,857 |
| 2075 | 57,618,555 | 22,414,609 |
| 2074 | 56,965,122 | 22,485,066 |
| 2073 | 56,292,259 | 22,550,427 |
| 2072 | 55,597,279 | 22,610,645 |
| 2071 | 54,903,565 | 22,669,042 |
| 2070 | 54,214,047 | 22,725,948 |
| 2069 | 53,520,311 | 22,779,050 |
| 2068 | 52,818,046 | 22,831,596 |
| 2067 | 52,125,908 | 22,885,941 |
| 2066 | 51,388,975 | 22,935,123 |
| 2065 | 50,658,129 | 22,985,942 |
| 2064 | 49,900,784 | 23,030,844 |
| 2063 | 49,155,513 | 23,071,114 |
| 2062 | 48,403,186 | 23,107,970 |
| 2061 | 47,648,039 | 23,139,924 |
| 2060 | 46,859,349 | 23,171,649 |
| 2059 | 46,066,772 | 23,199,387 |
| 2058 | 45,285,757 | 23,224,997 |
| 2057 | 44,507,961 | 23,247,211 |
| 2056 | 43,722,007 | 23,267,292 |
| 2055 | 42,925,488 | 23,278,653 |
| 2054 | 42,142,940 | 23,287,520 |
| 2053 | 41,351,412 | 23,297,347 |
| 2052 | 40,559,038 | 23,301,287 |
| 2051 | 39,768,198 | 23,302,108 |
| 2050 | 38,981,624 | 23,299,282 |
| 2049 | 38,210,212 | 23,293,630 |
| 2048 | 37,418,176 | 23,283,465 |
| 2047 | 36,648,598 | 23,267,251 |
| 2046 | 35,880,269 | 23,244,081 |
| 2045 | 35,104,973 | 23,212,221 |
| 2044 | 34,352,050 | 23,181,041 |
| 2043 | 33,590,931 | 23,144,217 |
| 2042 | 32,837,006 | 23,103,489 |
| 2041 | 32,086,067 | 23,056,478 |
| 2040 | 31,362,066 | 23,005,928 |
| 2039 | 30,621,558 | 22,948,866 |
| 2038 | 29,886,177 | 22,888,821 |
| 2037 | 29,155,330 | 22,822,943 |
| 2036 | 28,422,010 | 22,756,462 |
| 2035 | 27,709,891 | 22,685,766 |
| 2034 | 27,003,635 | 22,611,514 |
| 2033 | 26,292,134 | 22,532,374 |
| 2032 | 25,581,739 | 22,449,310 |
| 2031 | 24,875,542 | 22,364,063 |
| 2030 | 24,183,856 | 22,273,377 |
| 2029 | 23,494,522 | 22,181,300 |
| 2028 | 22,809,219 | 22,082,826 |
| 2027 | 22,131,874 | 21,979,196 |
| 2026 | 21,562,855 | 21,870,145 |
| 2025 | 21,003,705 | 21,756,000 |
| 2024 | 20,299,123 | 21,916,000 |
| 2023 | 19,319,064 | 22,037,000 |
| 2022 | 18,455,316 | 22,181,000 |
| 2021 | 17,828,273 | 22,156,000 |
| 2020 | 17,224,679 | 21,919,000 |
| 2019 | 16,685,223 | 21,803,000 |
| 2018 | 16,156,531 | 21,670,000 |
| 2017 | 15,622,759 | 21,453,000 |
| 2016 | 15,114,655 | 21,209,000 |
| 2015 | 14,647,621 | 20,970,000 |
| 2014 | 14,188,678 | 20,778,000 |
| 2013 | 13,691,079 | 20,585,000 |
| 2012 | 13,210,998 | 21,169,458 |
| 2011 | 12,754,997 | 21,009,048 |
| 2010 | 12,312,575 | 20,879,089 |
| 2009 | 11,893,754 | 20,756,435 |
| 2008 | 11,476,296 | 20,629,378 |
| 2007 | 11,081,660 | 20,492,545 |
| 2006 | 10,706,424 | 20,352,411 |
| 2005 | 10,328,092 | 20,216,524 |
| 2004 | 9,920,036 | 20,087,605 |
| 2003 | 9,487,833 | 19,951,521 |
| 2002 | 9,116,192 | 19,805,752 |
| 2001 | 8,804,124 | 19,600,362 |
| 2000 | 8,512,093 | 19,293,054 |
| 1999 | 8,222,705 | 18,944,731 |
| 1998 | 7,938,840 | 18,596,003 |
| 1997 | 7,670,366 | 18,248,200 |
| 1996 | 7,410,108 | 17,905,018 |
| 1995 | 7,089,064 | 17,564,068 |
| 1994 | 6,783,450 | 17,275,773 |
| 1993 | 6,629,146 | 17,025,918 |
| 1992 | 6,474,656 | 16,739,284 |
| 1991 | 6,205,676 | 16,475,354 |
| 1990 | 5,982,833 | 16,352,458 |
| 1989 | 5,819,586 | 16,248,557 |
| 1988 | 5,625,602 | 16,078,621 |
| 1987 | 5,438,309 | 15,916,576 |
| 1986 | 5,251,069 | 15,731,256 |
| 1985 | 5,096,269 | 15,544,154 |
| 1984 | 5,045,145 | 15,441,860 |
| 1983 | 4,979,130 | 15,388,794 |
| 1982 | 4,738,483 | 15,286,567 |
| 1981 | 4,520,959 | 15,099,414 |
| 1980 | 4,515,453 | 14,847,974 |
| 1979 | 4,505,384 | 14,579,614 |
| 1978 | 4,411,366 | 14,310,128 |
| 1977 | 4,331,667 | 14,049,371 |
| 1976 | 4,251,297 | 13,796,770 |
| 1975 | 4,167,234 | 13,548,984 |
| 1974 | 4,078,356 | 13,305,693 |
| 1973 | 3,985,909 | 13,060,916 |
| 1972 | 3,893,252 | 12,809,205 |
| 1971 | 3,807,316 | 12,551,910 |
| 1970 | 3,727,828 | 12,287,110 |
| 1969 | 3,651,113 | 12,013,858 |
| 1968 | 3,578,231 | 11,736,088 |
| 1967 | 3,508,512 | 11,457,328 |
| 1966 | 3,440,903 | 11,183,928 |
| 1965 | 3,374,220 | 10,916,965 |
| 1964 | 3,307,479 | 10,653,397 |
| 1963 | 3,240,905 | 10,395,040 |
| 1962 | 3,175,598 | 10,143,754 |
| 1961 | 3,111,947 | 9,899,372 |
| 1960 | 3,049,838 | 9,661,389 |
Data sources: United Nations | World Population Prospects (2026–2100, retrieved 2026-07-08); World Bank | Health (1960–2025, retrieved 2026-07-08).
GeoRank.org/population/chad/sri-lanka | CC BY 
From 2006 to 2016, the population of Chad increased by 4,408,231 people (a 41.2% growth), while Sri Lanka gained 856,589 people (a 4.21% growth).
For the next 10 years, from 2016 to 2026, Chad gained 6,740,482 people (a 44.6% growth), while Sri Lanka's population increased by 717,160 people (a 3.38% growth).
Chad was ranked 76th most populous country in 2006 and is 64th in 2026. Sri Lanka was ranked 55th in 2006 and ranked 63rd now.
The UN's World Population Prospects forecasts that in 24 years (in 2050) Chad's population will grow by 78.4% to 38,981,624 people with a rank change from 64th to 52nd. The population of Sri Lanka will increase by 6.26% to 23,299,282 people and rank change from 63rd to 71st.
Chad is projected to reach its peak in 2100 at 70.3M people compared to the peak of 23.3M people in 2051 for Sri Lanka.
Population growth rate by year
| Year | Growth rate | |
|---|---|---|
|
Chad
|
Sri Lanka
|
|
| 2100 | 0.46% | -0.56% |
| 2099 | 0.47% | -0.56% |
| 2098 | 0.56% | -0.55% |
| 2097 | 0.56% | -0.54% |
| 2096 | 0.57% | -0.53% |
| 2095 | 0.57% | -0.52% |
| 2094 | 0.63% | -0.51% |
| 2093 | 0.67% | -0.5% |
| 2092 | 0.68% | -0.49% |
| 2091 | 0.74% | -0.5% |
| 2090 | 0.75% | -0.49% |
| 2089 | 0.74% | -0.47% |
| 2088 | 0.8% | -0.46% |
| 2087 | 0.81% | -0.46% |
| 2086 | 0.86% | -0.45% |
| 2085 | 0.89% | -0.43% |
| 2084 | 0.91% | -0.42% |
| 2083 | 0.9% | -0.4% |
| 2082 | 0.99% | -0.4% |
| 2081 | 1% | -0.38% |
| 2080 | 1.04% | -0.38% |
| 2079 | 1.08% | -0.35% |
| 2078 | 1.08% | -0.33% |
| 2077 | 1.1% | -0.32% |
| 2076 | 1.14% | -0.31% |
| 2075 | 1.15% | -0.31% |
| 2074 | 1.2% | -0.29% |
| 2073 | 1.25% | -0.27% |
| 2072 | 1.26% | -0.26% |
| 2071 | 1.27% | -0.25% |
| 2070 | 1.3% | -0.23% |
| 2069 | 1.33% | -0.23% |
| 2068 | 1.33% | -0.24% |
| 2067 | 1.43% | -0.21% |
| 2066 | 1.44% | -0.22% |
| 2065 | 1.52% | -0.19% |
| 2064 | 1.52% | -0.17% |
| 2063 | 1.55% | -0.16% |
| 2062 | 1.58% | -0.14% |
| 2061 | 1.68% | -0.14% |
| 2060 | 1.72% | -0.12% |
| 2059 | 1.72% | -0.11% |
| 2058 | 1.75% | -0.1% |
| 2057 | 1.8% | -0.09% |
| 2056 | 1.86% | -0.05% |
| 2055 | 1.86% | -0.04% |
| 2054 | 1.91% | -0.04% |
| 2053 | 1.95% | -0.02% |
| 2052 | 1.99% | -0.004% |
| 2051 | 2.02% | 0.01% |
| 2050 | 2.02% | 0.02% |
| 2049 | 2.12% | 0.04% |
| 2048 | 2.1% | 0.07% |
| 2047 | 2.14% | 0.1% |
| 2046 | 2.21% | 0.14% |
| 2045 | 2.19% | 0.13% |
| 2044 | 2.27% | 0.16% |
| 2043 | 2.3% | 0.18% |
| 2042 | 2.34% | 0.2% |
| 2041 | 2.31% | 0.22% |
| 2040 | 2.42% | 0.25% |
| 2039 | 2.46% | 0.26% |
| 2038 | 2.51% | 0.29% |
| 2037 | 2.58% | 0.29% |
| 2036 | 2.57% | 0.31% |
| 2035 | 2.62% | 0.33% |
| 2034 | 2.71% | 0.35% |
| 2033 | 2.78% | 0.37% |
| 2032 | 2.84% | 0.38% |
| 2031 | 2.86% | 0.41% |
| 2030 | 2.93% | 0.42% |
| 2029 | 3% | 0.45% |
| 2028 | 3.06% | 0.47% |
| 2027 | 2.64% | 0.5% |
| 2026 | 2.66% | 0.52% |
| 2025 | 3.47% | -0.73% |
| 2024 | 5.07% | -0.55% |
| 2023 | 4.68% | -0.65% |
| 2022 | 3.52% | 0.11% |
| 2021 | 3.5% | 1.08% |
| 2020 | 3.23% | 0.53% |
| 2019 | 3.27% | 0.61% |
| 2018 | 3.42% | 1.01% |
| 2017 | 3.36% | 1.15% |
| 2016 | 3.19% | 1.14% |
| 2015 | 3.23% | 0.92% |
| 2014 | 3.63% | 0.94% |
| 2013 | 3.63% | -2.76% |
| 2012 | 3.58% | 0.76% |
| 2011 | 3.59% | 0.62% |
| 2010 | 3.52% | 0.59% |
| 2009 | 3.64% | 0.62% |
| 2008 | 3.56% | 0.67% |
| 2007 | 3.5% | 0.69% |
| 2006 | 3.66% | 0.67% |
| 2005 | 4.11% | 0.64% |
| 2004 | 4.56% | 0.68% |
| 2003 | 4.08% | 0.74% |
| 2002 | 3.54% | 1.05% |
| 2001 | 3.43% | 1.59% |
| 2000 | 3.52% | 1.84% |
| 1999 | 3.58% | 1.88% |
| 1998 | 3.5% | 1.91% |
| 1997 | 3.51% | 1.92% |
| 1996 | 4.53% | 1.94% |
| 1995 | 4.51% | 1.67% |
| 1994 | 2.33% | 1.47% |
| 1993 | 2.39% | 1.71% |
| 1992 | 4.33% | 1.6% |
| 1991 | 3.72% | 0.75% |
| 1990 | 2.81% | 0.64% |
| 1989 | 3.45% | 1.06% |
| 1988 | 3.44% | 1.02% |
| 1987 | 3.57% | 1.18% |
| 1986 | 3.04% | 1.2% |
| 1985 | 1.01% | 0.66% |
| 1984 | 1.33% | 0.34% |
| 1983 | 5.08% | 0.67% |
| 1982 | 4.81% | 1.24% |
| 1981 | 0.12% | 1.69% |
| 1980 | 0.22% | 1.84% |
| 1979 | 2.13% | 1.88% |
| 1978 | 1.84% | 1.86% |
| 1977 | 1.89% | 1.83% |
| 1976 | 2.02% | 1.83% |
| 1975 | 2.18% | 1.83% |
| 1974 | 2.32% | 1.87% |
| 1973 | 2.38% | 1.97% |
| 1972 | 2.26% | 2.05% |
| 1971 | 2.13% | 2.16% |
| 1970 | 2.1% | 2.27% |
| 1969 | 2.04% | 2.37% |
| 1968 | 1.99% | 2.43% |
| 1967 | 1.96% | 2.44% |
| 1966 | 1.98% | 2.45% |
| 1965 | 2.02% | 2.47% |
| 1964 | 2.05% | 2.49% |
| 1963 | 2.06% | 2.48% |
| 1962 | 2.05% | 2.47% |
| 1961 | 2.04% | 2.46% |
Data sources: United Nations | World Population Prospects (2026–2100, retrieved 2026-07-08); World Bank | Health (1961–2025, retrieved 2026-07-08).
GeoRank.org/population/chad/sri-lanka | CC BY
In 2025, the population of Chad grew by 3.47%, while Sri Lanka's population declined by 0.73%.
Live population counters
|
Chad
|
Sri Lanka
|
|
|---|---|---|
| Current population |
21855137
|
21926160
|
| Population rank | 64/197 | 63/197 |
| Percent of world population | 0.26% | 0.26% |
| One net population change |
44.9 seconds
|
3.29 minutes
|
| One birth every |
35.9 seconds
|
2.37 minutes
|
| One death every |
2.34 minutes
|
3.07 minutes
|
| Daily growth/decline | +1,930 | -438 |
| Annual growth/decline | +704,582 | -160,000 |
| Annual growth/decline rate | +3.47% | -0.73% |
| Population growth rate rank | 6/197 | 190/197 |
| One migration net change every |
4.28 minutes
|
17.2 minutes
|
| Annual migration change | -123,104 | -30,724 |
| Net migration rank | 184/196 | 165/196 |
| Foreign-born residents | 1,269,673 | 40,698 |
| Foreign-born residents rank | 50/195 | 156/195 |
| Foreign-born share of population | 6.3% | 0.2% |
| Foreign-born share rank | 83/195 | 190/195 |
Natural population change vs migration
| Year | Population change | |||
|---|---|---|---|---|
|
Chad
|
Sri Lanka
|
|||
| Natural | Migration | Natural | Migration | |
| 2025 | - | -123,104 | - | -30,724 |
| 2024 | 653,307 | 204,040 | 50,407 | -27,245 |
| 2023 | 605,924 | 496,830 | 66,111 | -28,011 |
| 2022 | 588,060 | 36,670 | 95,378 | -27,435 |
| 2021 | 554,851 | 74,509 | 121,858 | -29,586 |
| 2020 | 541,234 | 36,605 | 170,968 | -29,875 |
| 2019 | 530,540 | -29,451 | 172,243 | -28,426 |
| 2018 | 509,642 | 46,661 | 183,610 | -28,607 |
| 2017 | 494,304 | 16,916 | 187,993 | -22,324 |
| 2016 | 483,442 | 21,540 | 194,232 | -18,388 |
| 2015 | 478,010 | -48,918 | 201,815 | -29,797 |
| 2014 | 467,957 | 20,842 | 211,541 | -33,672 |
| 2013 | 454,517 | 51,887 | 221,021 | -37,754 |
| 2012 | 444,246 | 9,514 | 229,138 | -41,955 |
| 2011 | 428,989 | 29,256 | 224,461 | -90,839 |
| 2010 | 416,177 | 10,427 | 224,325 | -98,060 |
| 2009 | 401,937 | 9,108 | 200,175 | -81,130 |
| 2008 | 387,439 | 36,446 | 232,225 | -97,144 |
| 2007 | 376,732 | -11,339 | 248,287 | -109,695 |
| 2006 | 362,027 | 23,052 | 248,706 | -107,045 |
| 2005 | 352,302 | 19,281 | 248,683 | -118,594 |
| 2004 | 334,136 | 110,387 | 212,527 | -84,795 |
| 2003 | 314,740 | 105,140 | 252,008 | -107,573 |
| 2002 | 302,995 | 20,400 | 252,840 | -105,718 |
| 2001 | 297,254 | 3,484 | 244,377 | 19,273 |
| 2000 | 287,173 | -3,845 | 227,060 | 123,894 |
| 1999 | 278,264 | 17,175 | 206,876 | 138,799 |
| 1998 | 270,055 | 2,232 | 201,059 | 150,724 |
| 1997 | 261,030 | 3,631 | 208,193 | 135,636 |
| 1996 | 254,589 | 1,259 | 215,290 | 127,236 |
| 1995 | 234,010 | 152,232 | 221,957 | 117,416 |
| 1994 | 223,996 | 986 | 228,904 | 8,323 |
| 1993 | 229,984 | -146,386 | 226,257 | 36,232 |
| 1992 | 219,348 | 6,013 | 222,230 | 88,542 |
| 1991 | 200,102 | 112,492 | 218,117 | -1,047 |
| 1990 | 191,959 | -58,884 | 224,454 | -195,736 |
| 1989 | 188,485 | 4,924 | 212,401 | -33,305 |
| 1988 | 178,489 | 16,085 | 219,184 | -58,415 |
| 1987 | 156,797 | 23,220 | 226,414 | -63,105 |
| 1986 | 152,360 | 42,093 | 233,782 | -26,460 |
| 1985 | 145,845 | -30,686 | 247,836 | -80,950 |
| 1984 | 151,511 | -164,489 | 263,175 | -225,450 |
| 1983 | 144,684 | 247 | 277,768 | -209,362 |
| 1982 | 119,121 | 217,242 | 300,030 | -163,987 |
| 1981 | 111,907 | -13,232 | 328,096 | -89,824 |
| 1980 | 122,468 | -210,126 | 328,155 | -63,541 |
| 1979 | 117,780 | -9,974 | 329,791 | -57,683 |
| 1978 | 115,084 | -34,856 | 317,055 | -50,189 |
| 1977 | 113,498 | -34,318 | 300,038 | -45,383 |
| 1976 | 111,324 | -29,755 | 291,816 | -41,258 |
| 1975 | 109,315 | -22,768 | 282,496 | -37,475 |
| 1974 | 106,898 | -15,686 | 275,521 | -33,979 |
| 1973 | 104,418 | -10,737 | 278,577 | -30,582 |
| 1972 | 101,142 | -9,526 | 282,494 | -27,071 |
| 1971 | 89,404 | -9,153 | 281,200 | -22,021 |
| 1970 | 87,660 | -8,931 | 286,719 | -16,299 |
| 1969 | 83,413 | -8,714 | 286,218 | -10,152 |
| 1968 | 79,465 | -8,396 | 286,642 | -7,163 |
| 1967 | 76,142 | -7,771 | 284,738 | -6,696 |
| 1966 | 73,123 | -6,283 | 275,549 | -6,794 |
| 1965 | 70,913 | -4,384 | 272,422 | -7,249 |
| 1964 | 69,483 | -2,518 | 269,584 | -7,614 |
| 1963 | 67,414 | -1,228 | 262,880 | -8,118 |
| 1962 | 65,312 | -890 | 256,719 | -8,909 |
| 1961 | 63,639 | -760 | 251,087 | -10,144 |
| 1960 | 62,003 | -672 | 247,631 | -12,610 |
Data sources: World Bank | Health (1960–2025, retrieved 2026-07-08).
GeoRank.org/population/chad/sri-lanka | CC BY
Over the last 10 years, 86.4% of the population change in Chad is from natural causes (a gain of 5,439,314 people) and 13.6% is from migration (a gain of 855,402 people). In Sri Lanka 84.3% is from natural causes (a gain of 1,444,615 people) and 15.7% is from migration (a loss of 269,694 people).
As of 2024, 1,269,673 residents or 6.3% of the population were not native-born in Chad, compared to 40,698 people or 0.2% in Sri Lanka.
Biggest cities by population
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Population differences between Chad and Sri Lanka
|
Chad
|
Sri Lanka
|
|
|---|---|---|
| Life expectancy | 55.6 years | 78 years |
| Average age | 21.2 years | 36 years |
| Median age | 16.9 years | 34.4 years |
| Male:Female ratio | 50.2:49.8 | 48.4:51.6 |
| Fertility rate | 6.03 births per woman | 1.95 births per woman |
| Population density | 44.4 ppl/mi² | 916 ppl/mi² |
Population map with other countries
Data sources: World Bank | Health (1960–2025, retrieved 2026-07-08); United Nations | World Population Prospects (1960–2026, retrieved 2026-07-08); U.S. Census Bureau (1960–2025, retrieved 2026-07-08); Central Intelligence Agency (CIA) (2000–2019, retrieved 2026-07-08).
GeoRank.org/population/chad/sri-lanka | CC BY
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Data sources:
- World Bank | Health (1960–2025, retrieved 2026-07-08)
- United Nations | World Population Prospects (1960–2100, retrieved 2026-07-08)
- U.S. Census Bureau (1960–2025, retrieved 2026-07-08)
- Central Intelligence Agency (CIA) (2000–2019, retrieved 2026-07-08)
- Wikidata (2026, retrieved 2026-07-08)
Creative Commons Attribution (CC BY) — you’re free to copy, share, remix, adapt, and use even commercially as long as you give appropriate credit and clearly indicate if you made changes. Other sources may be subject to different license terms.