That's not what "obscurity" means.
When people say "Security by Obscurity", they mean that a system derives its sense of security from third parties not knowing how it works.
For example, imagine the following URL:
You see that an ...
The file will be downloaded to your machine's temporary files and viewed with a viewer in your browser (the Drive app). If there is a vulnerability in your browser, there is a chance that your machine will be infected.
If you are using an up-to-date browser, and since the file would have an old virus, if any, you have a low chance of infection.
Broadly speaking, you're just trying to implement DRM. DRM is fundamentally impossible to make truly secure - you can't give a user the ability to run a program / open a file / etc. without giving the ability to enable somebody else to do so - and the vast majority of efforts to implement it fail to do anything useful. Usually they just provide a little ...