Miriam Said:

Is it illegal to write a technical paper about a company without their permission?

We Answered:

You can write a paper about a company using public information, such as press releases, annual reports, and such, as long as you properly cite them.

Terry Said:

Does every Technical Writing job require a TS/SCI clearance?

We Answered:

Not every tech. writing job needs a clearance. Yes, it is very difficult to break into the field.

Considering you have several grammar errors in your question, I would suggest another field of endeavor.