To know if activation is necessary
To find out if a script is protected by an activation system and needs to be activated before being used, go to the description of the script concerned. In the info you can see if the script is protected by a DRM or not.
Yes = Works with DRM so, need to activate it (can be easily done in one click on the site)
Free DRM = Works without DRM, no need to activate it to use it.