I forwarded someone else's infringing video without knowing it. Do I constitute infringement?

It depends on the specific situation.

There are many kinds of torts, and the constitutive requirements of each kind of torts are different.

Take patent infringement as an example: the elements that constitute patent infringement include formal conditions and substantive conditions.

Among them, the formal requirements mainly include:

1, and the implementation behavior involves valid China patents;

2. The implementation behavior must be without the permission or authorization of the patentee;

3, the implementation of behavior must be for the purpose of production and operation. Whether the actor has subjective intention is not a formal requirement.

But it can be used as a basis to measure the seriousness of the plot. Whether the elements of patent infringement, that is, technical conditions and substantive implementation behavior belong to the scope of patent protection.