There are no "Adobe free stock videos". And you can't use watermarked assets except for preparing your work to show a client prior to buying the asset. All other use would consist a (c) infringement and could expose you to (c) claims.
This is not only true for Adobe, but for all stock footage providers. You need to acquire the license to use the data.
Regards, Abambo Hard- and Software Engineer and Photographer.
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