From Wikipedia:

From Wikipedia:

It was well documented that the first versions of the Streamer were near exact copies of the NS-Bass. The Spector NS-Bass was designed by Ned Steinberger for Stuart Spector in 1977, five years before Warwick was formed.

In the May 2012 article titled "Meet Your Maker: Hans Peter Wilfer of Warwick", an interview with Warwick founder and CEO in Bass Player Magazine, the following history is given explaining Wilfer's decision to make copies of the highly sought-after Spector NS-Bass: "'We didn’t see any reason to build Fender copycats, which players could get easily and cheaply from Asia, so we decided to focus only on high-end, innovative instruments.' In the mid ’80s, the Spector NS was tracking well in the U.S., but these basses proved hard to come by in Europe. H.P. saw that problem as a potential solution for the direction of his company and took up the task of designing his own version of this popular, ergonomically friendly instrument. That venture resulted in Warwick’s first widely successful instrument: the Streamer Stage I."

At the annual Musikmesse Show (Frankfurt, Germany) in 1985, Stuart Spector became aware that a new German-based company was producing exact copies of his now famous NS-Bass. Spector, along with Ned Steinberger, confronted Hans Wilfer and he agreed to pay a licensing fee to both Spector Guitars and Ned Steinberger in return for being able to continue to produce the Streamer without legal action.

Shortly after this agreement was reached, Spector was sold to Kramer Guitars. The new owners had no interest in pursuing Warwick to enforce the licensing agreement and Warwick continued to make the Streamer without any consequence.
In 1990, Kramer became insolvent and filed for bankruptcy. In the wake of their financial failure, Stuart Spector formed Stuart Spector Design, LTD. in 1992. In 1997 after a lengthy court battle, Stuart Spector was awarded the trademark and copyrights to Spector and threatened to sue Warwick to enforce the 1985 license agreement.

The pending litigation was eventually dropped because Warwick had changed the Streamer design and it was no longer an exact copy of the NS-Bass. In time, Warwick has evolved the design of the Streamer while Spector has sought to preserve the classic elements of the NS-Bass. Since 1984 very little has changed regarding the design, electronics and hardware of the Spector NS-Bass, whereas the Warwick Streamer has evolved into its own unique guitar and can no longer be considered a "copy" of the Spector, although it still has some of the general shape of the original.

Words from Spector side:
This was from PJ Rubal's Email, National Product Manager and Artist Relations for Spector.
"The truth is that Ned designed the NS curved body shape for Spector in March 1977. This was Ned’s first musical instrument design, and an instant hit. Warwick came on to the scene in 1984 with their Streamer bass, an obvious ‘version’ (ok, rip off) of the now very popular Spector NS. When approached by Spector, Warwick did agree to and did pay royalties (for a while) to Spector for their error. Stuart sold Spector to Kramer after that. Warwick stopped paying, Kramer chose not to pursue them.