Is there anyway I can show someone else's logo in a video I created without their permission.

Yes as long as the mark is not used with goods or services also offered by "someone else's logo". See intellectual property counsel.

Trademark infringement occurs when the new "mark" is similar in sight or sound to a preexisting mark for similar goods or services. But,...

I have a mobile app idea that I am going to promote to developers in the area. How do I keep them from stealing my idea?

Either by Trade Secret - its all yours if you can keep it secret. But consider Patenting - see Intellectual Property counsel.

Consult Intellectual Property counsel regarding the copyright term of the properties you intend to copy and distribute.

Do you need consent to take a pic of people who are behind your target of your pic?

No. See Intellectual Property counsel and review terms of any website where the photo will be posted.

The Asker's profit is irrelevant. Use of the "music" without permission is infringement. See Intellectual Property counsel.

Can an artist recreate a limited edition bronze and issue a new limited edition by changing just the bronze base ?

The issue is contract. Was there a representation that the "limited" edition was "limited". See contract counsel.

IN A FAMILY LAW If a person claims is the inventor of a patent, is this reported in his family law schedule of assets and debts?

The pending Patent Application is an asset to be listed.

Can i use a disclaimer to use other company logos in my video even though they did not endorse it, or sponsor it

Trademark Infringement occurs when a "mark" is similar in sight or sound for a similar goods or service. If the Asker's video has a commercial...

if the individual copyright copyright properties remain identifiable and you intend to commercialize the resulting mosaic then probably copyright...