Some Quick Points:
1. Those knives are not illegal to own
2. Those knives must be open carried with a sheath suspended from the waist (CA Penal Code)
3. Those knives may not be open carried in certain places, such as schools, city council meets, etc. --- you have to check that out for full details
4. City municipal code often trumps CA Penal code --- which means that in Los Angeles (for example) anything over 2.99 inches MAY NOT be open carried/concealed
A) exceptions to this law include religious practices that allow for it
B) Employment purposes
C) "Lawful Recreational Purposes" and travel to and from locations where it's utilized for "Lawful Recreational Purposes"
Examples of lawful recreational purposes would include a BBQ, bonfire, hike, camping, training, etc. ----- however, it is up to the officer detaining you to make this determination and then up to the City Attorney/DA's office to prosecute. I highly recommend carry the exact Penal Code and City Municipal Code # with you to provide to any detaining officer. It would also help to contact the police station nearby and ask to speak to a supervisor. That way if you're detained, you can reference the individual you spoke to and the Penal Code/Municipal Code. Speak courteously, respectfully, and confidently. You should be fine.
Also I've found that when walking in the city, make an effort to smile and be pleasant as people pass by and give you funny looks for what you're wearing. Each of us are ambassadors for the Knife Community and each of us have the power to undue the fear conditioning and the indoctrination of the city population. I've changed the mindset of at least a couple hundred people -- you can too. Welcome to the Sunny Side of the World