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* The base consist of ''tools that were made public more than 20 years ago or for which a Type 1 declaration is received''. Type 1, or option 1, is ISO speak for royalty-free.<ref name="iso-speak"/>
* 21<ref name="Licenses4_21Tools">{{cite web |last1=Samuelsson |first1=Jonatan |author1-link=Divideon |last2=Choi |first2=Kiho |author2-link==Samsung |last3=Chen |first3=Jianle |author3-link==Futurewei |last4=Rusanovskyy |first4=Dmytro |author4-link==Qualcomm |title=MPEG-5 Part 1: Essential Video Coding |url=https://ieeexplore.ieee.org/document/9146794 |website=ieeexplore.ieee.org |publisher=SMPTE |access-date=26 June 2021 |ref=Licenses21Tools21}}</ref> Tools in the enhanced have passed an extra compression efficiency justification and have possibility to be disabled individually.
Each of 21 [[payable]] tools can have separately
Every of 21 different coding tools from payable main profile can be individually turned off and, when necessary, replaced by a corresponding [[cost free]] baseline profile tool. This structure makes it easy to fall back to a smaller set of tools in the future, if, for example, [[License agreement|licensing]] complications occur around a specific tool, without breaking [[Computer compatibility#Software|compatibility]] with already deployed decoders. <ref name="Licenses4_21Tools"/>
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