Add license file

LICENSE.md

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+# License Information
+
+This dataset contains videos under multiple open licenses. Each video's specific license is recorded in the `licenseurl` field of the metadata.
+
+## Included Licenses
+
+### Public Domain
+Videos in the public domain have no known copyright restrictions and may be used freely for any purpose.
+
+### CC0 (Creative Commons Zero)
+https://creativecommons.org/publicdomain/zero/1.0/
+
+The creator has waived all copyright and related rights. You can copy, modify, distribute, and perform the work, even for commercial purposes, without asking permission.
+
+### CC BY (Creative Commons Attribution)
+https://creativecommons.org/licenses/by/4.0/
+
+You may share and adapt the material for any purpose, including commercially, as long as you give appropriate credit.
+
+### CC BY-SA (Creative Commons Attribution-ShareAlike)
+https://creativecommons.org/licenses/by-sa/4.0/
+
+You may share and adapt the material for any purpose, including commercially, as long as you give appropriate credit and distribute your contributions under the same license.
+
+## Excluded Licenses
+
+This dataset explicitly **excludes** videos with Non-Commercial (NC) restrictions:
+- CC BY-NC
+- CC BY-NC-SA
+- CC BY-NC-ND
+
+## How to Check a Video's License
+
+Each entry in `metadata.jsonl` includes:
+- `licenseurl`: The full URL to the license
+- `license_type`: A human-readable license name (e.g., "Public Domain", "CC BY")
+
+## Attribution
+
+When using CC BY or CC BY-SA licensed content, please provide attribution to the original creator as specified in the video's metadata.
+
+For all content, we recommend acknowledging:
+> Films courtesy of the Prelinger Archives, hosted by the Internet Archive.