Policy on Modifying Open Source Software

I'm looking to modify a [BSD licensed][1] JavaScript widget and looking for information about any approvals that are needed. The license itself is permissive and doesn't restrict modification. Our [Open Source Policy][2] doesn't specifically address modification. Does anyone have experience with our policies and procedures regarding modifying open source software? [1]:
http://en.wikipedia.org/wiki/BSD_licenses [2]:
https://thehub.thomsonreuters.com/docs/DOC-1411

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